They simply exist. Whatever the number is. Where do you get necessity from?
If minds “simply exist,” then they exist of their own nature, hence we could just as well say they “exist necessarily.”
Mind does not have any location in space or time. Minds are same.
Technically, no. I agree. It was just an illustration of difference. However, two or more minds are distinct in
some (or more) way, else they’d be the exact same entity.
Minds simply exists. They are not equivalent to existence. Each is its own existence. So your argument doesn’t follow. Why there should be one existence, one Mind?
But you are identifying mind with ultimate reality. If Mind (or really,
minds as you say) is distinct from existence, then existence must be prior to it. So Mind is not the Ultimate Reality, since Existence is not necessarily tied to (your definition of) “Mind.”
In your case, “minds” require a prior, more basic explanation.
So “Minds” do really explain anything at all.
Traditional theism would agree that Mind is the ultimate explanation, insofar as Mind and Existence are really one, but there is only one, and it is distinct from the rest of reality - which is
real.
Philosophically, we can see that any alternative of this would push back the question of ultimate reality. If said Mind and Existence were not one and the same, then there would be something prior that explains the existence of Mind. Hence, Mind cannot be ultimate. Alternatively, if there were more than one Minds, there would have to be some distinguishing factor, else they would be the same. But if they are different, something must account for this difference – a prior reality. Or, again, if this said One Mind were really one with all realities – like Pantheism – then that would mean this Ultimate Reality is (1) constantly changing and (2) made up of parts; but upon further reflection, Ultimate Reality cannot be either, since both of these require prior (more fundamental) causes.